Lathe boring tool



Jan. 9, 1923. 1,441,562

- 3. A. DENNARD.

LATHE BORING TOOL.

HL ED MAR. 5. 1921. 2 SHEETSSHEET 2.

Patented Jan. 9,

F t lt nr snnnnias A. pennant or EASTPORT, FLORIDA.

LATHE BORING TOOL.

Application filed March 5;

To all whom it may cmwernf 1 Be it known that I, SANDERS A. DENNARD, acitizen of the United States, and resident of Eastport,in the county ofDuval and State of Florida, have invented certain new and usefulImprovements in Lathe. Boring iijools of which the following is aspecification. s V This invention relates to lathe boring tools and theobject of the invention isto provide an improved boringtool or cutter.One object of the invention is to provide a boring tool adapted to besupported in both the head stock and the tail stock of the lathe,

while the cutter is fed by the lathe carriage,

and whereby great strength, rigidity and ac curacyin the operation ofthe tool are obtained. l

Another object is to provide a tool, sup ported as aforesaid, adaptedfor taper boring as well as straight boring. Still another object is toprovide novel and improved means for supporting and adjusting the outters. v a

With the aboveand other ancillary objects" in view my invention isembodied in a boring tool as hereinafter described and claimed and asillustrated in the accompanying drawings in which- Fig. 1 is a plan Viewof a boring tool einbodying my invention showing the same in.positionona-lathe, the latter being shown in dotted lines. i v

Fig. 2 shows the supporting bar in position for tapered boring.

Fig. 3 is a central sectional view through the tool head and cutters,parts being broken away. i e

Fig. 4t is a transverse sectional. view on line &-4. of Figure 3. d

Fig. 5 is a side view oi. the o1 clamping means therefor. i Fig. 6 is aface view of the clamping washer or ring. 1

Fig. 7 is a view of the tool head holder or post, parts being brokenaway.

Fig. 8 is a view online 8 8 of Figure 3, showing a modification. y M

Referring to Figure 1 the lathe is shown in outline and in dotted lines.The reference numeral 10 denotes the lathe as a whole, 11 is the headstock, 12 the chuck, 13 the work, 1 1 the carriage, 15 the tool post and16 the tail stock. s

The tool coniprises'a supporting bar or rod 17 which is supported at oneend in the ltters a nd 1921. Serial No. 450,007.

head stock center 18 and at the other end by 1 means of a taperedportion 19 supported in a taper socket in the tail stock. The bar isthus held fir nly clamped in position and at :tords a very strongsupport for the tool. The bar 17 is rigidly mounted and does not rotate.e On the bar 17 is mounteda tool head 20 which is in the form of asleeveas seen in Figure 3 and adapted to slide on the bar 17. The toolhead is provided with a shoulder 21 and is clamped inthertool holder2:2, the latter being forced. against the said shoulder 21 and firmlyclamped by a nut 25 is a pin adapted to enter a hole 26 inthe tool headand seat in any one ofthe grooves 27, 27 in the tool holder to preventrotation. of the tool head in the tool holder. The latter is suitablysecured to the tool post 15 on the lathe carriage 14;, so that as thelatter is moved towards the work 13 (by the usual means not shown) thetoolfhead 20 slides along the bar 17 as will be understood. 1

The tool head is formed with an enlarge- Inent 28wh1ch may he termed acutterhead, which is provided with three, substantially radial, grooves29, 30 and 310i unequal] depths. In thisinstance the groove 29is deeperthan thegroove 30 and the latter is deeper than the groove 81. f i

Each of the grooves receives a tool hit) cutters will. act progressivelyand successively as will he understood.

or cutter 32. Eachcutter is provided with I a cutting edge, 33 andteeth34. The'latter The cutters are clamped in the cutter head,.in thegrooves therein, by a stepped washer 88 which is provided .with threesteps 39, 40 and 41 which are offset to cor respond with thedifferentdepths of the grooves 29, 30 and 31 insuring that an evenpressure is exerted upon all the cutters when the clamping nut 42 isscrewed tight against the washer. 1 a

If it is desiredto use the tool for taper boring, a taper boring bar 45,see Figure 2, is employed. This bar is adapted to be used within thetool holder and the tool head in the same manner in which the. bar 17 isused. The one end of the taper boring bar tsiis' supported in the headstock centre 18 aforesaid, the other end of the taper boring bar isWithout'the taper 19 used on bar 17 and is supported on a center 50 inthe tail stock 16 which in this case is moved to one side as shown toprovide for the taper boring. The bar 45 is of the same diameterthroughout. Only one cutter will be used in boring tapers, the othertwocutters being set back far enough to be out of engagement. 1

Referrin 'to'Figure at: Wh te. seen that the washer 58 is provided withthree steps 60 and 61 of different graduated heights.

' Each step'is provided with a curved cam the" grooves 6e face thestepped Washer 58 which corresponds to the stepped washer 38in Figure 3.I

i A hole 75 is provided for the use of a spanner (not shown) for holdingthe step'pped washer 58' when the nut d2 back of it adjusted. .lnthiscase the cutters are a'd usted bv rotating the vasher 58 as will beunderstood. v

It Will be seen from the foregoing'that the boring toolherein disclosedis of a very simple construction, provides for great rigidity in itssupporting means and consequent accuracy inqoper'ation. Also that a widerange of adjustment is cared for;

During the operation the lathe carriage is niovedas usual along; thelathe towards a the worn-the carriage taking the tool holder.

along}; and thus feeding the cutters or bits into the Work. The toolhead is held firmly iinthe holder and the pin 25 positively preventsrotation oi the head relative to the holder. The oii'set position of thecutters facilitates the cutting as will'heunderstood and there are noobstructions to quick adjustment or" the cutters.

While I have disclosed my invention herein in its preferred form it Willbe understood that changes and alterations in the construction shownniayglae' made vvithin the principle of the'invention and the scope ofthe appended claims and that this'inventiou is not limited to any exactform, nuinberor shape of cutters.

The combination with a lathe" having a head stock, a tail stock'and' atool holder, of

a cutting tool coniprislng a solid supporting har", the one end ofWhichis adapted to he supported in the head stock ofthe lathe. the otherend of said har being. ta-

pered and. adapted to be supported inthe tail stock ofsaidlathe, a toolhead' mounted to Sl1Cl6 on the said bar, a cutter head formed'at thefront end of saidtool head,

'cuttingtools in said cutter head, means for clamping said tool head inthe 'saidtool holder -for oneratin said tool head towards and away fromthe work, a hole in said tool head, a plurality of grooves 1n said toolholder and a pin in said hole and adapted to engage any one of the saidgrooves for preventing rotative movement between said tool head and saidtoolholder;

Signed at Jacksonvillei in the county of Duval and State of Florida,this 21st day 01 February A. 11 1921.

simmer. DEN ARD.

